Cardiorespiratory endurance refers to a person’s ability to persist in a performance of moderate intensity for a long period of time. It reflects the ability to function effectively in normal daily activity and can be assessed with field tests such as the PACER or Walking Test. Aerobic capacity is typically measured by a lab test such as the maximal oxygen uptake test and refers to the amount of oxygen you can use in one minute of maximal activity. The terms are related, but they are not the same. For more information check the Science in Action feature in Fitness for Life, Seventh Edition, page 166.